有谁知道我如何在 Shiny 的应用程序中获取 textAreaInput 内的光标位置？
library(shiny)
ui <- fluidPage(
textAreaInput("hop"
,label="textarea",value = "Supercalifragilisticexpialidocious"),
verbatimTextOutput("out")
)
server <- function(input, output, session) {
output$out <- renderText({
"here I would like to get the cursor position (an interger?) \n inside que textArea"
})
}
shinyApp(ui, server)
我想我必须使用javascript，但我不知道从哪里开始。
问候
最佳答案
这是我找到的解决方案:
library(shiny)
ui <- fluidPage(tags$head(tags$script(
'Shiny.addCustomMessageHandler("prout",
function(NULL) {
var ctl = document.getElementById("hop");
var startPos = ctl.selectionStart;
var endPos = ctl.selectionEnd;
alert(startPos + ", " + endPos);
});'
)),
textAreaInput("hop"
,label="textarea",value = "Supercalifragilisticexpialidocious"),
verbatimTextOutput("out"),
actionButton("hop","hop")
)
server <- function(input, output, session) {
output$out <- renderText({
"here I would like to get the cursor position (an interger?) \n inside que textArea"
})
observeEvent(input$hop,{
message("hop")
session$sendCustomMessage(type="prout",message=list(NULL))
})
}
shinyApp(ui, server)
关于javascript - 如何获取 Shiny 文本区域输入中的光标位置，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50430219/